Hi Pingfan, Pingfan Liu <kernelf...@gmail.com> writes: > Technically speaking, echo 1/0 > cpuX/online is only a subset of cpu > hotplug/unplug, i.e. add/remove. The latter one includes the physical > adding/removing of a cpu device. Some user space tools such as kexec-tools > resort to the event add/remove to automatically rebuild dtb. > If the dtb is not rebuilt correctly, we may hang on 2nd kernel due to > lack the info of boot-cpu-hwid in dtb.
I notice you also sent a patch for ppc64_cpu to deal with CPUs being removed rather than just offlined. If I apply this patch then existing ppc64_cpu (without your other patch) will break. Is that right? cheers
